/*----------------------------------------------------------------------
| AP4_IsmaDecryptingProcessor:CreateTrackHandler
+---------------------------------------------------------------------*/
AP4_Processor::TrackHandler*
AP4_IsmaDecryptingProcessor::CreateTrackHandler(AP4_TrakAtom* trak)
{
// find the stsd atom
AP4_StsdAtom* stsd = dynamic_cast<AP4_StsdAtom*>(
trak->FindChild("mdia/minf/stbl/stsd"));
// avoid tracks with no stsd atom (should not happen)
if (stsd == NULL) return NULL;
// we only look at the first sample description
AP4_SampleDescription* desc = stsd->GetSampleDescription(0);
AP4_SampleEntry* entry = stsd->GetSampleEntry(0);
if (desc == NULL || entry == NULL) return NULL;
if (desc->GetType() == AP4_SampleDescription::TYPE_ISMACRYP) {
// create a handler for this track
AP4_IsmaCrypSampleDescription* ismacryp_desc =
static_cast<AP4_IsmaCrypSampleDescription*>(desc);
if (ismacryp_desc->GetSchemeType() == AP4_ISMACRYP_SCHEME_TYPE_IAEC) {
const AP4_UI08* key;
const AP4_UI08* salt;
if (AP4_SUCCEEDED(m_KeyMap.GetKey(trak->GetId(), key, salt))) {
return new AP4_IsmaTrackDecrypter(key, salt, ismacryp_desc, entry);
}
}
}
return NULL;
}
virtual TrackHandler* CreateTrackHandler(AP4_TrakAtom* trak) {
// find the stsd atom
AP4_StsdAtom* stsd = AP4_DYNAMIC_CAST(AP4_StsdAtom, trak->FindChild("mdia/minf/stbl/stsd"));
// avoid tracks with no stsd atom (should not happen)
if (stsd == NULL) return NULL;
// we only look at the first sample description
AP4_SampleDescription* desc = stsd->GetSampleDescription(0);
AP4_MpegAudioSampleDescription* audio_desc =
AP4_DYNAMIC_CAST(AP4_MpegAudioSampleDescription, desc);
if (audio_desc && audio_desc->GetObjectTypeId()==AP4_OTI_MPEG2_AAC_AUDIO_LC) {
// patch the stsd
AP4_MpegAudioSampleDescription new_audio_desc(AP4_OTI_MPEG4_AUDIO,
audio_desc->GetSampleRate(),
audio_desc->GetSampleSize(),
audio_desc->GetChannelCount(),
&audio_desc->GetDecoderInfo(),
audio_desc->GetBufferSize(),
audio_desc->GetMaxBitrate(),
audio_desc->GetAvgBitrate());
stsd->RemoveChild(stsd->GetChild(AP4_ATOM_TYPE_MP4A));
stsd->AddChild(new_audio_desc.ToAtom());
printf("audio sample description patched\n");
}
return NULL;
}
